Mix Proportion And Mechanical Properties Of Fiber Reinforced Self-compacting Concrete

In this thesis, mix proportion and basic mechanical properties of high strength steel fiber reinforced self-compacting concrete(HSSFRSCC) mixture were investigated. The main contents are as follows:1. The method of main skeleton volume optimization gap fill was adopted for mix proportion design. The applicability of manual mixture and mechanical mixture on SFRSC was discussed.2. The 24 standard cubic specimens of 150×150×150mm, 52 non-standard cubic specimens of 100×100×100mm and 69 standard prism specimens of 150×150×300mm were tested in compression. The results show that the cubic compressive strength and axial compressive strength were increased by 33% and 34% respectively for specimens of high strength self-compacting concrete(HSSCC) with 1% steel fiber in volume fraction.3. The 9 cube specimens of 100 × 100 × 100 mm were tested in splitting tension. The results indicate that the splitting tensile strength of HSSCC was raised by 20% when 1% steel fiber in volume fraction was used; the tension-compression ratios for HSSCC and SFRSC with1% steel fiber in volume fraction are 1/14.1 and 1/12.4, respectively. The brittle failure of HSSCC was avoided by mixing with steel fibers.4. The 63 small beam specimen with 100×100×400mm of SFRSCC were tested in flexure. The results demonstrate that the static flexural strength was increased with the increasing of steel fiber volume fraction. The growth of 30%, 40% and 110% for flexural strength of self-compacting concrete was achieved by mixing steel fibers in 1.0%、1.5% and 2.0% volume fraction, respectively. The fatigue life of HSSCC was increased 62 times by mixing 1% steel fibers in volume fraction. Moreover, the fatigue load in failure was increased by 27%.